A blue dye-sensitized solar cell based on a covalently bridged oligothiophene chromophore

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• 作者：Dora Demeter^a ; Fabio Melchiorre^b ; Paolo Biagini^b ; ; Riccardo Po^b ; Jean Roncali^a ; ^{jeanroncali@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Dye-sensitized solar cells ; Metal-free sensitizer ; Charge-transfer ; Color modulation
• 刊名：Tetrahedron Letters
• 出版年：2016
• 出版时间：27 January 2016
• 年：2016
• 卷：57
• 期：4
• 页码：505-508
• 全文大小：699 K

文摘

Two quaterthiophenes with a terminal electron acceptor cyanoacrylic acid anchoring group have been synthesized to serve as metal-free sensitizers in titanium dioxide-based dye-sensitized solar cells (DSSCs). The covalent bridging of the acceptor group with the adjacent thiophene ring by an ortho-phenylene unit leads to a large red shift of the internal charge-transfer band and to a strong decrease in its relative intensity. As a consequence of these spectral modifications, the color of the dye changes from orange to blue both in solution and after chemisorption on titanium dioxide. A preliminary evaluation of the bridged dye in DSSCs shows that the production of the blue color is associated with a decrease of the conversion efficiency of the cell.